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Page 4 Mr Michael Infurna Jr,Senior REHS September 24,2001 Groundwater Conditions The depth to the groundwater-bearing strata and its confining characteristics are unclear at this time because of differing geologic interpretations Monitoring data collected during the past year indicates that groundwater levels in the three wells occurs at a depth of about 22 to 25 feet below ground surface As shown in Figure 3, groundwater flows in a southeasterly direction As shown in Table 2, concentrations of petroleum compounds have been detected consistently in samples collected from well MW-2 Generally, petroleum compounds have not been detected in samples from MW-I and MW-3, although anomalous concentrations have been detected sporadically Concentrations of petroleum compounds in MW-2 samples are summarized as follows Benzene concentrations have ranged from 13,000 micrograms per liter(ug/1) to 20,000 ug/l, Toluene concentrations have ranged from 22,000 ug/1 to 38,000 ug/l, Ethylbenzene concentrations have ranged from 2,100 ug/1 to 4,000 ug/1, Xylenes concentrations have ranged from 11,000 ug/1 to 23,000 ug/1, TPHg concentrations have ranged from 70,000 ug/1 to 120,000 ug/1, Oxygenate compound tert butanol (TBA) concentrations have ranged from 45 ug/1 to 180 ug/l, Oxygenate compound methyl tert butyl ether (MTBE) concentrations have ranged from 6 6 ug/l to 20 ug/l, and, Oxygenate compound di isopropyl ether(DIPE) concentrations have ranged from 7 1 ug/l to 11 ug/l ' SITE INVESTIGATION WORKPLAN As part of this site investigation, PSC proposes to collect soil and groundwater samples by driving six probeholes and drilling and installing one groundwater monitoring well During this field mobilization, PSC proposes to drill and install one groundwater sparge well and one soil vapor extraction well to prepare for future site remedial activities Further description of these work components are contained in the following sections